Air suspension - improvement options
The stock air suspension is a nice feature, but causes a lot of headaches (air bags leak, expensive bags and shocks).
The Arnott coil over stinks (too soft, too high, noisy).
The Arnott GenII springs are stiffer, the Arnott-Bilstein are ok, but under dampened when combined with the GenII.
The only sure thing is the Hotchkis.
On top of it, the spring rate of the air bags get SOFTER when the car is lowered (should be the opposite).
Bilstein is offering to re-valve the Arnott-Bilstein shocks (at $80 or so plus 2 way shipping).
I was thinking of sticking firmer shocks into the Arnott-Bilsteins (but the re-valving seems a better bet).
One way of making the air springs firmer (at least in theory) would be to reduce the air volume inside the spring (fill with really heavy, high viscosity fluid comes to mind).
The other way: connect the top and bottom of the suspension with strong rubber ropes. at 4000 lbs weight, each spring is loaded with 1000 lbs. So finding a rope that can handle the elongation and produces say 250lb of force would pre load the spring by 25%, i.e. 25% higher spring rate.
A mechanical solution would also work nice, but haven't figured out how it could be done. Would be nice to install a progressive 'helper' spring that only loads up when at leavel 1 ride hight (for example).
On the other hand: there should be GOOD (vs. Arnott) fully adjustable (height, spring rate, dampening) solutions out there. My Passat sits low AND rides great on (quite inexpansive) Koni Yellow.
My friend finally was able to plant his 300Z with the installation of coil overs. BIG difference.
Does anyone know what suspension the RS6 Avant is using (unfortunately, we didn't get it here)?